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Circuit capable of expanding switching power supply output range and improving output characteristic

A technology of output range and output characteristics, used in output power conversion devices, conversion of DC power input to DC power output, electrical components, etc.

Active Publication Date: 2011-08-17
ITECH ELECTRONICS NANJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a circuit to solve the problem that the output of the existing power supply can obtain a wide range of high voltage / low current or low voltage / high current output within a certain power range, and realize faster and adjustable characteristics. Derating Characteristics of Output Voltage and Output Current

Method used

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  • Circuit capable of expanding switching power supply output range and improving output characteristic
  • Circuit capable of expanding switching power supply output range and improving output characteristic
  • Circuit capable of expanding switching power supply output range and improving output characteristic

Examples

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Embodiment Construction

[0029] Preferred embodiments of the present invention will be described in detail below according to the accompanying drawings.

[0030] Example figure 1 with figure 2 As shown, this embodiment provides a circuit that can expand the output range of the switching power supply and improve the output characteristics, including a CPU control circuit and a step-down circuit. The CPU control circuit includes an electronic load reference voltage circuit, voltage dividing resistors R1, R2, R3, transistor Q3, PWM state comparator 4, state comparison level terminal, electronic load enable signal terminal, current error amplifier 1 and voltage error amplifier 2; the step-down circuit includes MOS transistor Q1, diode D1, energy storage inductor L1 , Load resistor R4, current sampling resistor R5, capacitor C3, output capacitor C2, absorbing capacitor C1, drive circuit, PWM circuit and electronic load.

[0031] The drain of the MOS transistor Q1 is connected to the positive output of t...

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Abstract

The invention provides a circuit capable of expanding switching power supply output range and improving output characteristic. The circuit comprises a central processing unit (CPU) control circuit and also comprises a buck circuit, wherein the CPU control circuit provides a comparison signal, a control signal and a setting signal; the buck circuit is connected with the output end positive electrode and the output end negative electrode of a front-stage power supply; and the buck circuit comprises a metal oxide semiconductor (MOS) transistor Q1, a diode D1, an energy storage inductor L1, a load resistor R4, a current sampling resistor R5, a capacitor C3, an output capacitor C2, a drive circuit and a pulse width modulation (PWM) circuit. Very wide high-voltage / high-current output range capacity of high voltage / low current / or high current / low voltage can be respectively realized in a power supply chassis in a certain volume under certain power of a power supply by adding a circuit, and simultaneously extremely fast and adjustable dropping characteristics of the output voltage and the output current can be obtained.

Description

technical field [0001] The invention relates to the technical field of switching power supply control, in particular to a circuit capable of expanding the output range of a switching power supply and improving output characteristics. Background technique [0002] In the electronic laboratory, due to the need to test a variety of different products, the power supply usually selected needs to have a certain margin, because it is usually difficult to predict the various test requirements that may appear in the future. Therefore, the current situation in the market is that many laboratories must prepare multiple types of power supplies to meet testing requirements, because conventional DC power supplies include linear power supplies and switching power supplies, and the isolation transformer of linear power supplies and the high-frequency transformer of switching power supplies play an electrical role. Due to the dual functions of isolation and power transmission, its power outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
Inventor 张顺龙
Owner ITECH ELECTRONICS NANJING
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